A small product use standard 433.92MHz Remote controller module from Taobao. The transmitter and receiver is in figure 1
the reverse schematic drawn by myself, in figure 2 and figure3.
More than 100 unite are installed in different sites. the sites room is lead shield.
Normal case: push the transmitter button, the receiver will enable output, when release the button, the receiver will stop output.
Only 2 sites have this issue.
The issue is: push the transmitter button, the receiver will enable output, when release the button, the receiver will stop output. about 200-500ms later, the receiver will enable output again, and after about ~1s (it is random), the receiver stop output. It is easy to repeat the issue once per 3 times. I tried to turn off the transmitter power supply, the receiver has the same issue.
I tried 4 units in that site, all the 4 units have same issue. when I take the products back, cannot repeat the issue.
It is so strange!
Can any one give me some advice for investigation?
Thank you very much!
DE BD1QMP
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